<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>box</title>
    <style>
        .box {
            width: 300px;
            height: 300px;
            background-color: lightgray;
            /*padding: 10px;    !*四个方向，内边距全为10px*!*/
            /*padding: 10px 20px 30px 40px;   !*方向为上右下左*!*/
            /*padding: 10px 20px;   !*上下内边距为10px，左右为20px*!*/
            padding-top: 10px;   /*上*/
            padding-bottom: 10px;   /*下*/
            padding-left: 20px;   /*左*/
            padding-right: 20px;   /*右*/
            border-bottom: 2px solid darkcyan;
            border-left: 2px dashed purple;
            border-right: 2px dotted darkred;
        }
    </style>
</head>
<body>
<div class="box">
    达内云计算
</div>
</body>
</html>